Give the CafeRate regkey a value of 10000 and progressively decrease the value until the issue is resolved. A rate of 3000 should be considered the minimum value.

The above also helped with the 'no servers' issue on my network. I guess on some setups the server listings end up looking like flood traffic so the list will lock up on you :/ (frustrating lol). This registry value will lower that rate that the list populates at.

I hope that helps a little, have fun in TF2. Maybe I'll see you there sometime. :3